HTTP header response data

Question

I want to calculate the size in bytes of the http response headers and data in PHP. Any help would be appreciated

Are you serving the response headers, or expecting a response from another server that your PHP application contacts, say using cURL? — BoltClock
– BoltClock, Commented Oct 27, 2010 at 9:42
i managed to find the http request size using getallheaders(), now i want to calculate the size of the response data as well as size of http headers sent during response — RJ.
– RJ., Commented Oct 27, 2010 at 9:55

symcbean · Accepted Answer · 2010-10-27 11:19:13Z

1

You can't measure the size of the response headers from your PHP code because the webserver may change them before serving them up. Only the webserver can measure this - and you don't say what webserver you are using. With Apache, install mod_logio and start recording %I, %O and %B

answered Oct 27, 2010 at 11:19

symcbean

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4 Comments

RJ. Over a year ago

getheaders() would give you the complete header response, but it would add to additional call

symcbean Over a year ago

@RJ: only after the headers have been flushed (and only if the encoding is not chunked)

RJ. Over a year ago

Could you explain "encoding is not chunked", i didn't get it

symcbean Over a year ago

@RJ: if the encoding is chunked, then the webserver will send a set of headers, then the first chunk of the body, then more content which is effectively a header before the next chaunk - your PHP code doesn't know where the webserver has split the body

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